I have had serious issues with goggle fog. I agree with Mcguyver, Bolle T-800 are by far the best bang for the buck (There are better ones, ie dual lens, but twice the cost). The T-800 are rubber sealed, not foam, so no sweat is absorbed. It is also very easy to pop the lens for cleaning.
A little anti-fog and you are set (I had fog problems even with the T-800's, some good anti-fog and they are perfect).
One other note, they are low profile, great for Mich's etc, but they do not work so well with glasses (nose bridge), as a team mate pointed out after trying them on.
-Daes
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